
(6) M16C/20, M16C/21 Group
1 2 3 4 5 6 7 8 9 10
Vcc
Vss
TXD
RXD
SCLK
BUSY
CNVss
RESET
Vcc
BUSY
CLK
TXD
CE
EPM
GND
RESET
CNVss
RXD
Target board prepared by user
MCU peripheral circuit
MCU
Note2
Reset circuit
Note4
Note6
Note3
Serial cable
MFW-20SPe
Note1
MFW1U unit
Note5
Diagram 6
Note 1. Power supply of the MFW1U for serial programming is provided by a user target board via
Vcc pins. Connect the power of board to the Vcc terminal directory. Attach the AC adapter
to supply power when the current capacity of the target board is insufficient since the
maximum current consumption of the MFW1U for serial programming is 200mA. Usage
of Vcc should be 3.3V
±
5% or 5V
±
5%.
Note 2. Isolate TXD, RXD, SCLK, and/or BUSY terminals from the MCU peripheral circuit by
jumper, analog switch, three state, etc. when serial I/O programming is achieved.
Isolation can be omitted when those signal statuses are output from the MCU peripheral
circuit. Resistance should be 4.7K
Ω
or over when pull-up is achieved to these signals.
Note 3. Connect the MCU CNVss terminal to the CNVss terminal of the MFW1U unit by
achieving “pull down” with resistance of 4.7K
Ω
.
Note 4. Connect the reset terminal of the user target board MCU to the RESET terminal of the
MFW1U directly when the reset circuit of the user target board is “open collector output”,
“CR delay circuit”, or constant current load circuit is less than dozens of
μ
A.
Execute the
same procedure as “Note 2” when it is “CMOS output”.
Note 5.
The Vss terminal should be connected since it is signal ground.
Note 6. Adaptor for the target ‘MFW-20SPe’ for exclusive use is required in serial programming.
* Please combine with this example of a connection circuit, and confirm a "Hardware
manual" or a "Data sheet" of each microcomputer.
Multifunctional Flash Microcomputer [S550-MFW1U]
28
Operation Manual